Fallen Fortress (Grey 3307) Fortress The recommended heat sources are

The recommended heat sources are those used for reptiles such as a heating cable or reptile heating pad

for the size of colonies we have available (15-30 workers) would last for several months at the current size

This is why we recommend 85 degrees

I highly recommend reviewing these studies

Fallen Fortress (Grey 3307) Fortress The recommended heat sources are***Ordering the product on this page? You will receive the exact formicarium in the photos accompanying this product page. This formicarium has already been made and can be modified only with the options for glass type and removable vent lid.*** Features: Medium Species Chambers Decor (Per Product Photo) Large Water Tower (15 ml capacity) Magnetically Removable Glass Type III Material 4x4x4 Foraging Area 4x4x2 Nest Block Completion Times For Black